KR102589093B1 - Coating layer removal apparatus having vibrator and superannuated pipe rehabilitation method using the same - Google Patents

Abstract

The present invention provides a paint film removal device that efficiently cuts and peels the paint film on the inner surface of a pipe by swinging rotating cutters by vibrators when performing a paint film removal process, and a device for projecting material nozzles on the inner surface of the pipe when performing a surface treatment process. We provide a shot blasting device that automatically adjusts the distance to the optimal spray distance by a non-powered method (using the repulsion force generated when spraying projectile material) and a non-contact method that prevents damage to the inner surface of the pipe, and a method of rehabilitating old pipes using these devices. .

Description

Paint film removal device with vibrator and old pipe rehabilitation method using the same {COATING LAYER REMOVAL APPARATUS HAVING VIBRATOR AND SUPERANNUATED PIPE REHABILITATION METHOD USING THE SAME}

Embodiments of the present invention mainly relate to devices, methods, etc. used to rehabilitate aged underground pipes.

Steel pipes, cast iron pipes, concrete pipes, and synthetic resin pipes are used for water pipes, sewer pipes, and other gas pipes and oil pipes for the purpose of transporting fluids. Among these pipes, steel pipes have excellent mechanical properties and are lightweight, so they are mainly manufactured as large pipes. It is being used.

When such pipes for fluid transport are used for a long period of time, internal damage may occur due to aging due to the fluid flowing along the pipe and various foreign substances and additives contained therein. In particular, steel pipes, which are widely used as water pipes, form a coating film on the inner surface to prevent internal corrosion in order to supply water more safely. Therefore, damage to the inner surface where the coating film peels off as it ages can cause contamination of the water supply.

The problem of pipe deterioration can be solved by replacing old pipes buried underground and constructing new pipes. However, this is uneconomical because it involves high construction costs, problems with land compensation, and causes various civil complaints. Accordingly, the more preferred solution is the rehabilitation method of old pipes, which prolongs the lifespan of old pipes by regenerating them through construction that is mostly carried out within the pipes.

To rehabilitate old pipes, paint removal devices and shot blasting devices are used. These devices can perform rehabilitation work while moving along the inside of the pipe (pipe line). The paint film removal device performs a paint film removal process to remove the paint film and foreign substances such as scale attached thereto from the inner surface of the pipe as a rehabilitation work. As a rehabilitation operation, the shot blasting device performs a surface treatment process on the inner surface of the pipe on which the paint film removal process by the paint film removal device has been performed.

Generally, the paint film removal device is configured to perform a paint film removal process by cutting the paint film using a cutter, and the shot blasting device is configured to perform a surface treatment process by projecting a projection material to the inner surface of the pipe. do.

Here, since the coating film removal device simply relies on a cutter to cut and peel the coating film, the cutting efficiency is bound to be low. To improve cutting efficiency, if the rotation speed of the cutter or the pressure of the cutter against the coating film is increased, high temperature frictional heat may be generated between the coating film and the cutter, and the part cut from the coating film may melt due to frictional heat. In addition, the melted portion may adhere to the cutter, further reducing cutting efficiency.

Meanwhile, pipes exist in various sizes, and steel pipes can be transformed into a shape whose cross-sectional area is reduced up and down and enlarged left and right due to external forces acting from above, such as earth pressure. Therefore, it is difficult for the shot blasting device to maintain a constant spray distance for the projectile on the inner surface of the pipe. If the projection distance is changed, the quality of the surface treatment may become uneven.

Republic of Korea Patent Publication No. 10-1031312 (2011.05.02.) Republic of Korea Patent Publication No. 10-1705100 (2017.02.09.) Republic of Korea Patent Publication No. 10-1910415 (2019.01.04.)

Embodiments of the present invention are intended to further improve the speed and efficiency of the coating film removal process for rehabilitation of old pipes.

Embodiments of the present invention are intended to further improve the speed and quality of the surface treatment process for rehabilitation of old pipes.

The problem to be solved is not limited to this, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, a car body configured to be movable along the inside of an aged pipe; a rotating body provided on the vehicle body and rotated about a center axis in the front-back direction by a rotation drive unit; A paint film removal device may be provided that is spaced apart from each other along the circumferential direction of the rotating body and includes a plurality of cutting machines that cut the paint film to remove the paint film from the inner surface of the tube.

Specifically, each of the cutting machines includes an inner first arm coupled to an edge portion of the rotating body; an outer second arm that is rotatably connected to the front end of the first arm about the arm axis in the front-back direction and is spaced apart from or approaches the inner surface of the tube depending on the direction of rotation; a rotary cutter provided at the tip of the second arm to be rotatable about the cutter axis in the front-back direction, and contacting the inner surface of the pipe when the second arm approaches the inner surface of the pipe; an actuator, each end of which is connected to the first arm and the second arm, and which brings the rotary cutter into close contact with the inner surface of the pipe through an expansion/contraction operation; It may include a vibrator that applies vibration to the second arm to generate a fluctuation in the second arm in the rotation direction of the second arm. Depending on implementation conditions, etc., each of the cutters may be configured so that the rotary cutter rotates around the cutter axis due to a driving force from a motor or the like.

Here, each of the cutting machines is an air vibrator in which the vibrator is driven by air pressure, the air vibrator is provided in the second arm, and air is discharged from the air outlet of the air vibrator. An air nozzle that sprays toward the rotary cutter to cool and clean the rotary cutter and its surroundings may be connected.

Additionally, each of the cutters may have a cooling liquid supply line connected to the air nozzle. Accordingly, the air nozzles may spray a fluid mixed with the air and cooling liquid toward the rotating cutter. According to the cooling liquid supply line, the cooling and cleaning effects on the rotary cutter and its surroundings can be further improved.

According to an embodiment of the present invention, a car body configured to be movable along the inside of an aged pipe; a projector mounted on the vehicle body; A shot blasting device may be provided, including a projection material feeder that supplies projection material to the projector.

Specifically, the projector includes a forward-backward axis member rotated by an axis drive unit; fixing arms provided along a circumferential direction of the shaft member; Movable arms provided on each of the fixed arms to be able to reciprocate in a first direction in which the tip portion is spaced apart and a second direction in which the tip portion is approached with respect to the inner surface of the pipe; projection material nozzles provided on each of the movable arms and spraying the projection material into the inner surface of the pipe along the second direction using pneumatic pressure; It may include a spray distance controller that moves each of the movable arms to adjust the distance of the projection nozzles with respect to the inner surface of the pipe to a set optimal spray distance.

Here, the spray distance controller includes elastic members that provide elastic force to the movable arms in the second direction between the fixed arms and the movable arms, respectively, and the elastic members are used to control the projection material by the projection material nozzles. It may have elasticity (elasticity coefficient) that allows movement of the movable arms in the first direction according to the repulsive force generated during spraying and adjusts the distance of the projection nozzles with respect to the inner surface of the pipe to the optimal spraying distance. . Accordingly, the spray distance controller can control the optimal spray distance in a non-contact manner using the repulsion force without contacting the inner surface of the pipe.

Each of the movable arms may be moved in the first direction and the second direction along a radial direction centered on the shaft member, and each of the projection nozzles may be directed to the inner surface of the pipe.

The shaft member may be a hollow tube that transports the projection material. The projector includes a distribution block provided at the tip of the shaft member and having a main flow path connected to a hollow part of the shaft member and branch flow paths branching circumferentially from the main flow path; It may further include projection material transfer lines connecting the projection material nozzles to the branch passages, respectively.

In addition, the projector may further include a distribution guide that guides the projection material transferred to the main flow path through a hollow of the shaft member between the main flow path and the branch flow paths to the branch flow paths. The distribution guide may have a guide surface inclined from the center of the main flow path to each of the branch flow paths.

According to an embodiment of the present invention, a car body configured to be movable along the inside of an aged pipe; A projector and a projection material supply device each mounted on the vehicle body for surface treatment of the inner surface of the pipe, wherein the projection material supply includes a projection material supply tank, a projection material replenishment tank, a projection material supply line, a projection material pressure delivery unit, and A shot blasting device may be provided, comprising a pressure reducing unit.

Here, the projection material supply tank includes a projection material supply chamber, a projection material supply port communicating with a lower portion of the projection material supply chamber, and a projection material inlet communicating with an upper portion of the projection material supply chamber, and the projection material supply port is opened and closed. It may be provided with a supply valve that opens and closes the projection material inlet. The projection material replenishment tank may be provided with a projection material storage chamber and a projection material discharge port communicating with a lower portion of the projection material storage chamber. The projection material supply line may connect the projection material inlet and the projection material outlet. The projection material pushing unit may supply the projection material discharged through the projection material supply port to the projector. The pressure reduction unit includes a first suction module provided at an upper portion of the projection material supply tank to communicate with the projection material supply chamber and a second suction module connected to the projection material supply line, wherein the projection material supply chamber and the projection material supply By lowering the pressure in the line to a pressure lower than atmospheric pressure by the suction of the first suction module and the suction of the second suction module to generate a pressure difference between the projection material supply chamber and the projection material storage chamber, the projection material stored in the projection material storage chamber The projection material can be transferred to the projection material supply chamber by the pressure difference.

The shot blasting device, which includes the projection material supply tank, the projection material replenishment tank, the projection material supply line, the projection material pressure delivery unit, and the pressure reduction unit, is sprayed into the inner surface of the pipe by the projector and a projection material recovery unit for recovering the projection material that has fallen to the bottom of the projection material replenishment tank; It may further include a blowing unit that sprays gas toward the projection material that has fallen to the bottom of the pipe in front of the projection material recovery unit to separate dust from the projection material that has fallen to the bottom of the pipe.

The first suction module and the second suction module may be provided with a filter that blocks the inflow of the projected material and allows the inflow of foreign matter smaller than the projected material during the suction process.

When supplying the projection material to the projector, the supply inlet valve may be controlled to be open, and the inlet valve may be controlled to be closed. In addition, when supplying the projection material to the projector is stopped and the projection material supply chamber of the projection material supply tank is replenished with the projection material in the projection material storage compartment of the projection material replenishment tank, the supply port valve is in a closed state. controlled, and the inlet valve can be controlled to be in an open state.

According to an embodiment of the present invention, a car body configured to be movable along the inside of an aged pipe; A projector and a projection material supply device each mounted on the vehicle body for surface treatment of the inner surface of the tube, wherein the projection material supply unit includes a plurality of projection material supply tanks; a single jet replenishment tank; a projection material supply line connecting the projection material supply tanks to the projection material replenishment tank; a projection material supply unit connecting the projection material supply tanks to the projector and supplying the projection material discharged from any one of the projection material supply tanks to the projector; a projection material recovery unit for recovering the projection material that has been sprayed onto the inner surface of the pipe by the projector and fallen to the bottom of the pipe into the projection material replenishment tank; It includes suction modules provided to each of the projection material supply tanks, and the pressure of one of the projection material supply tanks is lowered to a negative pressure by the suction of the suction module provided to the selected projection material supply tank. By generating a pressure difference between the projection material supply tank and the projection material replenishment tank, the projection material stored in the projection material replenishment tank includes a pressure reduction unit that transfers the projection material stored in the projection material supply tank to the selected projection material supply tank by the pressure difference; , the decompression unit transfers the projection material stored in the projection material replenishment tank to another selected among the projection material supply tanks while the projection material is supplied to the projector from any one selected among the projection material supply tanks. An operative, shot blasting device may be provided.

According to an embodiment of the present invention, the paint film removal device as described above is introduced into the rehabilitation section of the pipe, and the paint film removal device is moved along the inside of the pipe to remove the paint film from the inner surface of the pipe. Step (paint film removal process); Injecting the shot blasting device as described above into the rehabilitation section and performing surface treatment on the inner surface of the pipe from which the paint film has been removed while moving the inserted shot blasting device along the interior of the pipe (surface treatment fair) and; Injecting a painting device into the rehabilitation section, and performing painting on the inner surface of the pipe on which the surface treatment was performed while moving the introduced painting device along the interior of the pipe (painting process), an aged pipe. Rehabilitation methods can be provided.

The means of solving the problem will become more specific and clear through the examples and drawings described below. In addition, various solution methods other than those mentioned below may be additionally presented.

According to an embodiment of the present invention, while performing a paint film removal process using rotary cutters (see 235), vibration is applied by vibrators (see 237) to swing the rotary cutters, thereby cutting the paint film more efficiently. It can be peeled off.

In addition, the vibrators are air vibrators, and the high-pressure air used and discharged from the air vibrators is sprayed toward the rotary cutters by the air nozzles (see 239), so that the discarded high-pressure air can be reused for cooling the rotary cutters. there is. Accordingly, it is possible to prevent the phenomenon in which the portion of the coating film that is cut by the rotary cutters is melted by high-temperature frictional heat and adheres to the blade portion of the rotary cutters (causing a decrease in cutting efficiency).

According to an embodiment of the present invention, when spraying a projection material to perform a surface treatment process, the distance of the projection material nozzles (see 110) with respect to the inner surface of the pipe is changed between the non-powered method (using the repulsion force generated when spraying the projection material) and the non-contact method. It can be automatically adjusted to the optimal spray distance (refer to 100D) set by (to prevent damage to the inner surface of the old pipe due to contact).

In addition, during the surface treatment process, a pressure difference is created between the projection material supply tank (see 310) and the projection material replenishment tank (see 320) to transfer the projection material from the projection material replenishment tank to the projection material supply tank, Projection materials can be replenished more quickly and accurately with a simple and compact structure.

As a result, embodiments of the present invention can provide improved constructability through improved process speed, process quality, etc.

The effect of the invention is not limited to this, and other effects not mentioned can be clearly understood by those skilled in the art from this specification and the attached drawings.

Figure 1 is a flowchart showing a method for rehabilitating an old pipe according to an embodiment of the present invention.
2 to 4 are schematic diagrams showing steps of a method for rehabilitating old pipes according to an embodiment of the present invention.
Figures 5 to 9 show the configuration of a paint film removal device as an old pipe rehabilitation device according to an embodiment of the present invention.
Figures 10 to 14 show the configuration of a shot blasting device as an old pipe rehabilitation device according to an embodiment of the present invention.
Figure 15 is a configuration diagram conceptually showing a painting device as an old pipe rehabilitation device according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In describing embodiments of the present invention, if it is judged that specific descriptions of related known functions or configurations may unnecessarily obscure the gist of the present invention, the detailed descriptions will be omitted, and parts that perform similar functions and actions will be omitted. The same symbols will be used throughout the drawings.

At least some of the terms used in the specification are defined in consideration of the functions in the present invention and may vary depending on the user, operator intention, custom, etc. Therefore, the term should be interpreted based on the content throughout the specification. In addition, in the specification, when it is said that a certain component is included, this does not mean that other components are excluded, but that other components may be further included, unless specifically stated to the contrary. And, when a part is said to be connected (or combined) with another part, this refers not only to the case where it is connected (or combined) directly, but also to the case where it is indirectly connected (or combined) with another part in between. Includes.

Meanwhile, in drawings, the size, shape, and thickness of lines of components may be somewhat exaggerated for ease of understanding.

According to an embodiment of the present invention, an old pipe rehabilitation device used to rehabilitate an old pipe, a method for rehabilitating an old pipe using the same, etc. can be provided. For example, an old pipe may be a water supply pipe (steel pipe) buried to transport water.

A method for rehabilitating an old pipe according to an embodiment of the present invention is shown in FIGS. 1 to 4. With reference to FIGS. 1 to 4 , a method for rehabilitating an old pipe according to an embodiment of the present invention will be first looked at as follows.

(Rehabilitation preparation work) First, a rehabilitation section 12 is set in the pipeline of the pipe 10 to be rehabilitated (hereinafter, the accompanying drawing symbols are omitted), and the fluid passing through the set rehabilitation section 12 ( For example, it blocks the flow of constant water). The rehabilitation section 12 may be set to a length that takes into account rehabilitation conditions, etc. For example, the rehabilitation section 12 can be set in the range of 0.5 km to 2.0 km. In order to block the fluid flow in the rehabilitation section 12, a method of preventing fluid from flowing into the rehabilitation section 12 by closing the pipe opening and closing valve installed on the upstream side of the rehabilitation section 12, and directing the flow of fluid to another pipe A method of preventing fluid from flowing into the rehabilitation section 12 from the upstream side by bypassing the fluid may be used.

Next, a work port 14 is constructed to insert the old pipe rehabilitation device into the rehabilitation section 12, and a ventilation hole 16 is constructed to spatially connect the rehabilitation section 12 to the outside. As shown in FIGS. 2 to 4, a work tool 14 is placed at one of both ends of the rehabilitation section 12, and a ventilation hole 16 is placed at the other end. Unlike shown, the work tool 14 may be provided at both ends of the rehabilitation section 12, and the ventilation hole 16 may also be provided to serve as the work tool 14.

Next, external air is supplied to the rehabilitation section 12 through the work opening 14, and the air in the rehabilitation section 12 is discharged to the outside through the ventilation hole 16 located opposite the work opening 14. Install a ventilation device (20) for. Once the work port 14 and the vent 16 are constructed, the air supply device 22 is installed on the work port 14 side and the exhaust device 26 is installed on the vent 16 side to provide the ventilation device 20. can do. Ventilation ducts 24 and 28 communicating with the rehabilitation section 12 may be connected to the air supply device 22 and the exhaust device 26, respectively.

Then, when construction of the ventilation hole 16 is completed, a dust collection device 30 is installed on the ventilation hole 16 side to treat dust generated in the rehabilitation section 12 during rehabilitation work. A dust collection duct 32 communicating with the rehabilitation section 12 may be connected to the dust collection device 30.

(Cleaning and drying work) Next, a dredging device, drainage device, etc., not shown, is introduced into the rehabilitation section 12 through the work tool 14 to clean the rehabilitation section 12. According to the dredging device and the drainage device, sediments such as sand and soil accumulated in the rehabilitation section 12 can be removed and the remaining fluid accumulated in the rehabilitation section 12 can be discharged to the outside. This cleaning operation may be performed in parallel with the process of constructing the work tool 14 and the ventilation hole 16 or installing the ventilation device 20 and the dust collection device 30. When the cleaning work on the rehabilitation section 12 is completed, the dredging equipment and drainage equipment, etc. that were used are removed to the outside of the rehabilitation section 12.

Next, using the ventilation device 20, external air is forcibly supplied to the rehabilitation section 12 by the air supply device 22, and the air within the rehabilitation section 12 is supplied by the exhaust device 26. By discharging to the outside, the rehabilitation section 12 is dried.

After cleaning the rehabilitation section 12 in the above order and completing the drying process, the old pipe rehabilitation equipment includes a paint film removal device (A10, see Figure 2), a paint film collection device (not shown), and shot blasting. Rehabilitation work is performed using a device (A30, see Figures 3 and 4), a painting device (A50, see Figure 4), etc.

The rehabilitation work includes a paint film removal process using a paint film removal device (A10) and a paint film collection device (see Figure 2), a surface treatment process using a shot blasting device (A30) (see Figures 3 and 4), and a painting device ( The painting process using A50) (see FIG. 4) is performed in that order, followed by the dry inspection process. Each of these processes is explained in turn.

(Paint film removal process) After the paint film removal device (A10) is introduced into the rehabilitation section (12) through the work tool (14), the existing paint film formed on the inner surface of the pipe is removed by the paint film removal device (A10). do. In general, water pipes are coated with coal enamel as a coating film on the inner surface, and as they are used for a long period of time, foreign substances such as hard scale adhere to the coating film. In the paint film removal process, the paint film removal device A10 can remove the paint film (coltal enamel) and various foreign substances (scale, etc.) attached thereto.

Next, the paint film collection device is put into the rehabilitation section 12 through the work tool 14, and the paint film (paint film) that falls off from the inner surface of the pipe to the bottom of the pipe is removed by the paint film removal device A10. (Including foreign substances such as scale attached to the film) are collected by a paint film collection device.

The paint film removal device A10 is configured to peel and remove the paint film by cutting it, thereby minimizing dust generation and shortening (speeding up) the work time. The paint film removal device A10 is composed of a separate device independent of each device for the surface treatment process, painting process, etc. to be performed later, and as shown in FIG. 2, the paint film removal device A10 moves independently along the inside of the pipe and applies the paint. The membrane is removed from the inner surface of the tube.

The paint film collection device is also composed of a separate device that is independent from other old pipe rehabilitation devices, so it can move independently and collect the fallen paint film.

For reference, if any two or more of the paint film removal device (A10), paint film collection device, shot blasting device (A30), and painting device (A50) are connected as one device, any one unit device among all connected devices Even if a malfunction occurs, problems that significantly slow down work may occur, such as having to stop the entire device for repairs and then resume work. In particular, since the paint film removal device A10 removes the paint film by cutting the paint film, breakdowns may occur more frequently than other old pipe rehabilitation devices. Therefore, if the old pipe rehabilitation devices are independently configured and operated, the entire rehabilitation work can be carried out more quickly.

In Figure 2, the work progress direction of the paint film removal device A10 is expressed. As shown in FIG. 2, the paint film removal device A10 removes the paint film while moving from the work tool 14 toward the ventilation hole 16 in the rehabilitation section 12. Although not shown, the paint film collection device collects the paint film while moving from the ventilation hole 16 toward the work tool 14 in the direction opposite to the work direction of the paint film removal device A10 in the rehabilitation section 12.

In this way, if the paint film removal and the removed paint film collection are carried out together, the entire paint film removal process can be quickly performed. After performing the paint film removal process, the paint film removal device A10 and the paint film collection device can be removed to the outside of the rehabilitation section 12 through the work tool 14.

(Surface treatment process) Next, the shot blasting device (A30) is introduced into the rehabilitation section (12) through the work tool (14), and the inner surface of the pipe on which the paint film removal process was performed is performed by the shot blasting device (A30). Perform surface treatment. In other words, the projection material is projected onto the inner surface of the pipe at high speed to perform surface treatment as a pretreatment process for the subsequent painting process. The shot blasting device A30 is also composed of a separate device that is independent from other old pipe rehabilitation devices, and as shown in FIGS. 3 and 4, it moves independently along the inside of the pipe and projects the projection material to the inner surface of the pipe.

In Figure 3, the work progress direction of the shot blasting device (A30) is expressed. Referring to FIG. 3 and the like, the shot blasting device A30 moves from the work hole 14 to the vent hole 16 in the rehabilitation section 12 and processes the inner surface of the pipe with a projection material.

(Painting process) Next, the painting device A50 is introduced into the rehabilitation section 12 through the work tool 14, and the inner surface of the pipe on which the surface treatment process has been performed is painted with the painting device A50. In the case of the painting device (A50), it is composed of a separate device independent of other old pipe rehabilitation devices and sprays paint on the inner surface of the pipe while moving independently along the inside of the pipe.

In Figure 4, the work progress direction of the painting device A50 is expressed. As shown in FIG. 4, the painting device A50 moves toward the work tool 14 from the ventilation hole 16 in the direction opposite to the working direction of the shot blasting device A30 in the rehabilitation section 12, performing a painting process. Perform.

For example, when the surface treatment process for a certain section of the rehabilitation section 12 is completed (this may be the amount of work per day), the surface treatment by the shot blasting device A30 is temporarily stopped and the rehabilitation section 12 is completed. The painting process can be performed by moving the painting device (A50) placed in toward the ventilation hole (16), placing it on the shot blasting device (A30) side, and then moving it toward the work tool (14). That is, the surface treatment process using the shot blasting device A30 and the painting process using the painting device A50 can be performed alternately to complete the surface treatment process and the painting process.

In contrast, while proceeding with the surface treatment process (moving the shot blasting device A30 from the ventilation hole 16 to the work tool 14 side), an appropriate distance is maintained from the progress section of the surface treatment process and the painting process (painting device It is also possible to carry out the surface treatment process and the painting process in parallel by moving (A50) from the work tool 14 to the ventilation hole 16 side. However, if the progress section of the surface treatment process is close to the progress section of the painting process, painting defects (dust incorporation into painting, etc.) may occur due to a large amount of dust generated during surface treatment, so the surface treatment process and the painting process It is desirable to proceed alternately or together while maintaining an appropriate distance between the surface treatment process section and the painting process section.

Thereafter, when the painting process is completed, the shot blasting device A30 and the painting device A50 can be removed to the outside of the rehabilitation section 12 through the work tool 14.

(Dry inspection process) Next, the ventilation device 20 is operated to dry the paint applied to the inner surface of the pipe and the rehabilitation status of the rehabilitation section 12 is inspected.

For reference, in terms of improving the working environment, it is desirable to continuously operate the ventilation device 20 to provide ventilation even when performing the paint film removal process, surface treatment process, painting process, etc. on the rehabilitation section 12.

Meanwhile, in the surface treatment process, a relatively large amount of dust is generated compared to other processes, so even if the dust collector 30 is not necessarily operated in other processes except the surface treatment process, the dust collector 30 is installed during the surface treatment process. It is desirable to operate (30). By operating the dust collection device 30, the rehabilitation work environment can be improved, such as preventing problems such as difficulty in securing visibility due to dust, and thus work can be done while easily checking the rehabilitation status of the pipe.

As an old pipe rehabilitation device for the old pipe rehabilitation method according to an embodiment of the present invention, the paint film removal device (A10), the paint film collection device, the shot blasting device (A30), and the painting device (A50) are each operated directly by an operator. It may be a type or a type that is controlled using a remote control device from outside the rehabilitation section 12 (for example, on the ground). In the case of the latter remote control type, the device may be equipped with cameras, lights, etc. to enable monitoring of the rehabilitation section 12, rehabilitation work status, etc. from outside the rehabilitation section 12.

(Paint film removal device) Figures 5 to 9 show a paint film removal device (A10) according to an embodiment of the present invention.

In Figure 5, the overall configuration of the paint film removal device A10 is conceptually shown. Referring to FIG. 5, the paint film removal device (A10) includes a car body (bogie, A11) configured to move along the duct (inside) of the pipe, and a rotation assembly (A12) mounted on the car body (A11), It further includes a plurality of cutters (A13) and an elevating assembly (A14).

The car body A11 of the paint film removal device A10 includes a car body frame 211 configured to provide a mounting space, wheel units 212 that provide mobility to the car body frame 211, and these wheel units 212. It may include a wheel drive unit (not shown) for rotating one or more selected ones. The wheel units 212 may be arranged at intervals so as to be spaced apart from each other in the front-to-back direction. The wheels of each wheel unit 212 may be arranged in the left and right directions. The wheel drive unit may include a motor. In one example, the motor of the wheel drive unit may be an air motor. The air motor of the wheel drive unit may be operated to generate rotational force by receiving pneumatic pressure from a pneumatic supply source (not shown), and is connected to the pneumatic pressure supply source via an air regulator (not shown) to be adjusted to the required level. Pneumatic pressure can be supplied. The motor of the wheel drive unit may be an electric motor instead of an air motor.

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5, FIG. 7 is a cross-sectional view taken along line B-B of FIG. 5, and FIG. 9 is a cross-sectional view taken along line C-C of FIG. 5, which schematically show the corresponding cross sections. Referring to FIGS. 5 to 7, the rotation assembly (A12) includes a center axis 221 disposed in the front-back direction in the front area on the vehicle body A11, and a disk-shaped member rotatable about the center axis 221. It includes the entire body 222 and a rotation drive unit 223 for rotating the rotating body 222. The center axis 221 is a fixed axis. 5 and 9, the center axis 221 is supported by the lifting assembly A14. The central portion of the rotating body 222 is rotatably coupled to the center axis 221. The rotation drive unit 223 may include a motor. The rotation drive unit 223 may further include a power transmission mechanism that transmits rotational force from the motor to the rotating body 222. The power transmission mechanism of the rotation drive unit 223 may be configured using gears. For example, the motor of the rotation drive unit 223 is an air motor and can be operated to generate rotational force by receiving pneumatic pressure adjusted to a required level by the aforementioned pneumatic pressure source and air regulator. The motor of the rotation drive unit 223 may be an electric motor instead of an air motor.

Figure 8 shows the operation of the cutting machines A13, etc. The cutters (A13) are provided along the circumferential direction of the rotating body 222, rotate around the center axis 221 together with the rotating body 222, and cut the coating film. As a result, the coating film can be peeled off from the inner surface of the pipe. As shown in FIGS. 6 to 8, each of these cutters (A13) has an inner first arm 231 whose proximal end is coupled to the rotating body 222, and a proximal end at the distal end of the first arm 231. The outer second arm 233 is connected so as to be rotatable about the arm axis 232 in the front-back direction and is spaced apart or close to the inner surface of the pipe depending on the direction of rotation, and at the tip of the second arm 233. The rotary cutter 235 is provided to be rotatable about the cutter axis 234 in the front-back direction, and the second arm 233 is rotated with respect to the first arm 231 to elastically fit the rotary cutter 235 to the inner surface of the pipe. It includes an actuator 236 for close contact.

The first arms 231 may be arranged radially around the center axis 221. The second arms 233 may be folded or unfolded relative to the first arms 231 depending on the direction of rotation. When the second arms 233 are folded relative to the first arms 231, the tip portions of the second arms 233 may be spaced apart from the inner surface of the pipe. When the second arms 233 are unfolded relative to the first arms 231, the tip portions of the second arms 233 can be approached against the inner surface of the tube. When the tip portions of the second arms 233 approach the inner surface of the tube, the blades of the rotary cutters 235 may come into contact with the inner surface of the tube.

The actuators 236 are linear actuators that expand and contract by hydraulic pressure. Each of the actuators 236 is rotatably connected at both ends to a first arm 231 and a second arm 233 that are connected to each other by hinges in the forward and backward directions. When the length of the actuators 236 is contracted, the second arms 233 can be folded relative to the first arms 231 (see Figure 6). When the length of the actuators 236 is extended, the second arms 233 can be unfolded relative to the first arms 231 (see Figure 8). In addition, as the second arms 233 are unfolded with respect to the first arms 231 by the actuators 236, when the tip portions of the second arms 233 approach the inner surface of the pipe, the rotary cutter 235 ) allows the blade to adhere to the inner surface of the pipe. In this way, according to the actuators 236, the second arms 233 can be folded or unfolded with respect to the first arms 231 according to the size and shape of the inner circumference of the tube, and the rotary cutters 235 are used to fold and unfold the inner circumference of the tube. It can be kept in close contact with.

Each of the cutting machines A13 further includes a vibrator 237 that applies constant vibration to the second arm 233 to vibrate the second arm 233 in the rotational direction of the second arm 233. When the second arms 233 are oscillated by the vibration of the vibrators 237, the rotary cutters 235 are slightly moved against the inner surface of the pipe by the oscillation movement of the second arms 233 and the stretching operation of the actuators 236. The process of separating and then coming into contact again can be repeated. Therefore, when the rotating cutters 235 are rotated about the center axis 221 to remove the coating film from the inner surface of the pipe, the coating film can be cut while being struck by the rotating cutters 235. Therefore, the efficiency of cutting the coating film by the rotating cutters 235 and the peeling efficiency of the cut coating film can be increased.

In each of the cutting machines A13, the vibrator 237 is mounted on the second arm 233, is driven by air pressure, and supplies air whose pressure is adjusted to the required level by the aforementioned pneumatic pressure source and air regulator. This is an air vibrator. Accordingly, the vibrators 237 have an air inlet and an air outlet, and are provided with a vibration element that is operated to generate vibration by air passing at high pressure through a passage between the air inlet and the air outlet. The vibrators 237 may be known air vibrators having balls, rollers, turbines or pistons as vibrating elements.

As shown in FIG. 8, etc., each cutting machine (A13) is connected to an air inlet with an air supply line 238 that supplies air from the aforementioned pneumatic supply source, and to an air outlet is connected to the air discharged from the air outlet. An air nozzle 239 that sprays toward the rotating cutter 235 is connected. At this time, the air nozzle 239 may be extended from the air outlet toward the rotary cutter 235 so that the injection hole formed at the tip faces one side of the circumference of the rotary cutter 235.

According to these air nozzles 239, high-pressure air that has been used and discarded to generate vibration in the vibrators 237 can be reused for purposes such as cooling and cleaning the rotary cutters 235. In particular, it cools the phenomenon in which the part of the coating film that is cut by the rotary cutters 235 is melted by the high temperature frictional heat generated during cutting and adheres to the blade of the rotary cutter 235 (causing a decrease in cutting efficiency). This action can prevent it, and the phenomenon of foreign substances being caught between the rotating cutters 235 and the coating film can be resolved through the cleaning action.

Meanwhile, although not shown, each of the cutters A13 may have a cooling liquid supply line connected to the air nozzle 239. According to these cooling liquid supply lines, cooling liquid at a predetermined temperature (for example, room temperature or lower) can be supplied intermittently or continuously from the cooling liquid supply source to the passages of the air nozzles 239. Therefore, the air nozzles 239 can spray air mixed with the cooling liquid toward the rotating cutters 235. Accordingly, the cooling and cleaning effects of the rotary cutters 235 and their surroundings using the air nozzles 239 can be further improved.

Cutters (A13) may be provided in two rows. As shown in FIGS. 5, 6, etc., the front cutters A13F are provided on the front rotating body 222F, and the front rotating body 222F is rotated at a set speed by the front rotating drive unit 223F. can be rotated As shown in Figures 5 and 7, rear cutters (A13R) spaced a certain distance rearward from the front cutters (A13F) are provided on the rear rotor (222R), and the rear rotor (222R) ) may be rotated by the rear rotation drive unit 223R at the same or different set speed as the front rotor 222F. The front rotating body 222F and the rear rotating body 222R may rotate in opposite directions. For example, when viewed from the front, the front rotary body 222F can be rotated clockwise by the front rotary drive unit 223F, and the rear rotary body 222R can be rotated clockwise by the rear rotary drive unit 223R. It can be rotated counterclockwise by .

Referring to FIG. 9, the lifting assembly A14 includes a lifting member 241 that supports the center axis 221, a lifting guide mechanism 242 that guides the lifting member 241 from both sides so that it moves accurately in the up and down direction, It may include a support frame 243 for supporting the lifting guide mechanism 242 while mounted on the car body frame 211 of the car body A11, and a lifting drive unit 244 for moving the lifting member 241. You can. The lifting drive unit 244 may include a hydraulic actuator.

According to this type of lifting assembly A14, the shaft member 104 can be moved up and down depending on the size of the pipe and positioned near the center of the pipe.

(Paint film collection device) Although not shown, the paint film collection device may include a car body, a paint film transport conveyor, a paint film collection brush, and a guide.

The body of the paint film collection device may be configured to be self-propelled and movable along the inside of the pipe (pipe line). The paint film transport conveyor is mounted on the car body and moves with the car body, and can be arranged in the front and rear directions of the car body. The paint film collection brush is installed on the front side of the paint film transport conveyor to be rotatable about the axis in the left and right directions while in contact with the bottom of the pipe. It is rotated by a driving force, and when rotated, the paint film that falls on the bottom of the tube is moved to the rear. It can be removed from the paint film transport conveyor side. The guide may be configured to guide the paint film struck by the paint film collection brush between the paint film transport conveyor and the paint film collection brush onto the paint film transport conveyor.

(Shot blasting device) A shot blasting device (A30) according to an embodiment of the present invention is shown in FIGS. 10 to 14.

Figure 10 conceptually shows the overall configuration of the shot blasting device A30. As shown here, the shot blasting device (A30) is centered on a car body (bogie, A31) configured to move along the inside (pipe line) of the pipe, and an axis (axis, 100A) in the front-back direction on the car body (A31). A projector (A32) that rotates at a constant speed and projects the projection material to the inner surface of the pipe, and a projection material supply device ( A33).

In the shot blasting device A30, a car body A31 includes a car body frame 101, and a projector A32 and a projection material feeder A33 are mounted on the car body frame 101. In addition, the car body A31 of the shot blasting device A30 includes wheel units 102 that provide mobility to the car body frame 101, and a wheel drive for rotating one or more selected wheel units 102. Additional units (not shown) may be included. The wheel units 102 may be arranged at intervals so as to be spaced apart from each other in the front-to-back direction. The wheels of each wheel unit 102 may be arranged in the left and right directions. The wheel drive unit may include a motor. In one example, the motor of the wheel drive unit may be an air motor. The air motor of the wheel drive unit may be operated to generate rotational force by receiving pneumatic pressure from the pneumatic supply source of the shot blasting device (A30), and is connected to this pneumatic pressure supply source through an air regulator (not shown) to maintain the required level. Adjusted pneumatic pressure can be supplied. The motor of the wheel drive unit may be an electric motor instead of an air motor.

Referring to FIGS. 10 and 13, the projection material supply unit A33 includes a projection material supply tank 310, a projection material replenishment tank 320, a projection material supply line 325, a projection material pressure delivery unit 330, and a pressure reduction unit. Includes units 340 and 345. Both the projection material supply tank 310 and the projection material replenishment tank 320 are provided on the body A31 of the shot blasting device A30.

The projection material supply tank 310 has a projection material supply chamber 311 provided therein, a projection material supply port communicating with the lower part of the projection material supply chamber 311, and a projection material supply port communicating with the upper part of the projection material supply chamber 311. It is provided with a projection material inlet, and is provided with a supply valve 312 for opening and closing the projection material supply port and an inlet valve 313 for opening and closing the projection material supply port. The projection material replenishment tank 320 has a projection material storage chamber 321 provided therein, and is provided with a projection material discharge port communicating with the lower part of the projection material storage chamber 321. The projection material supply line 325 connects the projection material inlet and the projection material outlet, and the projection material pressure delivery unit 330 uses pneumatic pressure (high-pressure gas) from the pneumatic source of the shot blasting device A30 to supply the projection material to the projection material supply port. The projection material discharged by gravity and its own load is supplied to the projector (A32), and the pressure reduction units (340, 345) lower the pressure in the projection material supply chamber 311 and the projection material supply line 325 to release the projection material. The projection material stored in the storage chamber 321 is transferred to the projection material supply chamber 311 by a pressure difference.

Here, the projection material pressure delivery unit 330 includes a pressure delivery line connected to the projection material supply port. The pneumatic pressure source and air regulator of the shot blasting device A30 can supply pneumatic pressure adjusted to the required level to the pressure delivery line of the projection material pressure delivery unit 330 in the projection material pressure delivery direction. The decompression units 340 and 345 include a first suction module 340 provided to communicate with the projection material supply chamber 311 and a second suction module 345 connected to the projection material supply line 325. The first suction module 340 and the second suction module 345 may each be equipped with a filter that blocks the internal inflow of projection materials during the suction process and allows foreign substances such as dust smaller than the projection material to enter the interior to remove foreign substances. You can.

For example, the first suction module 340 and the second suction module 345 are connected to a suction force generation source, thereby discharging air from the projection material supply chamber 311 and the projection material supply line 325, respectively, to the projection material supply chamber ( 311) and the projection material supply line 325 can be depressurized.

As another example, the first suction module 340 and the second suction module 345 may be configured to have a passage passage having a first open end and a second open end connected to the pneumatic pressure source of the shot blasting device (A30), respectively. there is. In addition, the middle portion of the passage passage of the first suction module 340 may be in communication with the projection material supply chamber 311, and the middle portion of the passage passage of the second suction module 345 may be connected to the projection material supply line 325. It can communicate with the inside. According to this, the high-pressure gas provided from the pneumatic supply source of the shot blasting device A30 passes through the passage passage of the first suction module 340 and the passage passage of the second suction module 345 at high speed (first open end). injection, discharge to the second open end) to lower the pressure of the passages, thereby discharging the air in the projection material supply chamber 311 and the air in the projection material supply line 325 to the outside through the passages to the projection material supply chamber ( 311) and the projection material supply line 325 can be depressurized.

While supplying the projection material to the projector A32, the first suction module 340 and the second suction module 345 are in a stopped state, the supply inlet valve 312 is in an open state, and the inlet valve 313 is in a closed state. It is controlled. While the projection material in the projection material supply tank 310 is almost or completely exhausted and the projection material stored in the projection material replenishment tank 320 is supplied to the projection material supply tank 310, the first suction module 340 and the second suction All modules 345 are switched to the operating state, the supply valve 312 is controlled to be switched to the closed state, and the inlet valve 313 is controlled to be switched to the open state. When the first and second suction modules 340 and 345 are operated, the internal pressure of both the projection material supply chamber 311 and the projection material supply line 325 may be lowered to a negative pressure state lower than atmospheric pressure. For example, the first suction module 340 and the second suction module 345 may be controlled so that the projection material supply chamber 311 is maintained in a negative pressure state that is lower than the inside of the projection material supply line 325.

According to the pressure drop action of the pressure reduction units 340 and 345, the pressure of the projection material storage chamber 321 in the projection material replenishment tank 320 is the internal pressure of the projection material supply line 325 and the projection material supply tank 310. The pressure of the projection material supply chamber 311 is higher than that of the projection material, and the projection material stored in the projection material replenishment tank 320 is supplied to the projection material supply tank 310 along the projection material supply line 325 due to this pressure difference. At this time, the dust mixed in the projection materials is discharged from the projection material supply tank 310 and the projection material supply line 325 by the suction and exhaust action of the first suction module 340 and the second suction module 345. is discharged as Accordingly, only the projection material is stored in the projection material supply tank 310 with the dust removed.

Referring to FIG. 10, the projection material replenishment tank 320 is formed to have a structure with an open top for inputting projection material, and a foreign matter larger than the projection material is placed in the open upper part to prevent the input of foreign matter. A removal mesh 323 is provided. The projection material supplier A33 may further include a projection material recovery unit 350 that recovers the projection material that is sprayed onto the inner surface of the pipe by the projector A32 and falls on the bottom of the pipe to the projection material replenishment tank 320. there is. As shown in FIG. 10, the projection material recovery unit 350 circulates the buckets through the upper side of the projection material replenishment tank 320 and the bottom side of the pipe, and collects the projection material that has fallen on the bottom of the pipe into the projection material replenishment tank ( 320) may be a bucket conveyor configured to pump into the open top. The height of the projection material recovery unit 350 from the bottom of the pipe can be adjusted by a height adjustment unit (equipped with an actuator, 351). According to the projection material recovery unit 350, the projection material can be recovered more quickly and easily from the bottom of the pipe to the projection material replenishment tank 320.

Referring to FIG. 10, a blowing unit 119n may be provided in front of the projection material recovery unit 350. The blowing unit 119n is disposed in front of the car body A31 of the shot blasting device A30 and may include a fan and a blowing nozzle. The blowing unit 119n can separate foreign substances such as dust from the projection materials that have fallen on the bottom of the pipe by spraying gas (air, etc.) toward the projection materials that have fallen on the bottom of the pipe. Therefore, the projection material recovery unit 350 can recover the projection materials in a state in which foreign substances have been separated by the blowing unit 119n.

Fig. 14 shows a modified example of the projection material supply machine A33. As shown in FIG. 14, the projection material supply machine A33 may be provided with a plurality of projection material supply tanks 310. In addition, according to this design change, the projection material supply line 325 connects the projection material supply tanks 310 and the projection material replenishment tank 320 to a main supply line and branch supply lines branched into multiple branches from the main supply line. It may be configured to be connected by (325a, 325b), and the projection material delivery unit 330 is configured to transfer the projection material discharged from any one of the projection material supply tanks 310 from the main pressure delivery line and the main pressure delivery line. It may be configured to supply to the projector A32 through branched pressure feed lines 330a and 330b, and the first suction module 340 may be provided in each of the projection material supply tanks 310, The second suction module 345 may be applied to the branch supply lines 325a and 325b, respectively. The main supply line and the branch supply lines 325a and 325b may be connected by a valve (eg, a three-way valve). According to the design change as described, during the process of pressurizing and supplying the projection material from any one of the projection material supply tanks 310 to the projector A32, the projection material is transferred from the projection material replenishment tank 320 to the projector A32. By operating in a manner that transfers and replenishes the remaining supply tanks 310, the shot blasting device (A30) can be operated continuously without stopping work due to replenishment of projectile material.

Referring to FIGS. 10 and 11 , the projector A32 may be disposed in the front portion of the vehicle body frame 101 in the vehicle body A31 constituting the shot blasting device A30. This projector A32 includes a center frame module 103 provided on the vehicle body frame 101, an axis member 104 rotatably provided on the center frame module 103 about an axis 100A in the front-back direction, and an axis. It includes a shaft drive unit 105 for rotating the member 104, and a rotary blasting head (see reference numerals 107, 108, 109 and 110) for projecting the material around the shaft member 104. A rotary blasting head is provided around the shaft member 104. When the shaft drive unit 105 is activated, the shaft member 104 rotates, and the rotary blasting head rotates together with the shaft member 104.

The center frame module 103 may include a lower frame mounted on the vehicle body frame 101, an upper frame coupled to the lower frame so as to be movable in the vertical direction, and an elevating drive unit that moves the upper frame. The shaft member 104 may be mounted on the upper frame. When the lifting drive unit is activated, the upper frame is moved in the vertical direction relative to the lower frame. At this time, since the shaft member 104 moves in the same direction as the upper frame, the shaft member 104 can be located near the center of the pipe according to the specifications of the pipe.

The shaft drive unit 105 may include a motor. The shaft drive unit 105 may further include a power transmission mechanism (for example, a power transmission mechanism using a gear, belt, or chain) that transmits the rotational force from the motor to the shaft member 104. For example, the motor of the shaft drive unit 105 is an air motor and can be operated to generate rotational force by receiving pneumatic pressure adjusted to a required level by the pneumatic pressure source of the shot blasting device A30 and the air regulator.

The rotary blasting head includes a rotary base 106 that rotates in the same direction with the axis member 104, and an arm module (reference numerals 107 and 108) provided radially around an axis 100A in the front-back direction to the rotary base 106. and 109), and a projection nozzle 110 provided at the tip area of each arm module.

Each of the arm modules includes a fixed arm 107 firmly coupled to the rotary base 106, and a first direction spaced apart from the fixed arm 107 with respect to the inner surface of the pipe (see arrow direction shown in (a) of FIG. 12). and a movable arm 108 provided to be reciprocally movable in a second direction (see the arrow direction shown in (b) of FIG. 12) approaching, and a movable arm 108 between the fixed arm 107 and the movable arm 108. It includes an elastic member 109 that provides elastic force in the second direction. The projection nozzles 110 are mounted on the tip portions of the movable arms 108 to face the inner surface of the pipe. The first direction and the second direction opposite thereto may correspond to a radial direction centered on the front-back axis 100A.

When an external force acts on the movable arms 108 in the first direction, the movable arms 108 move in the first direction while overcoming the elastic force of the elastic members 109, so that the projection material nozzles 110 are placed on the inner surface of the pipe. may be relatively spaced apart. Conversely, when the external force acting on the movable arms 108 in the first direction is removed, the movable arms 108 are moved in the second direction by the restoring force of the elastic members 109, so that the projection material nozzles 110 It can be accessed relative to the inner surface of the pipe.

When the projection material is sprayed at high pressure from the projection material nozzles 110 by pneumatic pressure, a repulsive force according to the projection material injection pressure is generated in the projection material nozzles 110. The direction in which the projection material is ejected from the projection material nozzles 110 may generally be in the second direction, and the repulsive force generated in this process may generally act on the projection material nozzles 110 in the first direction.

Accordingly, the projection material nozzles 110 are moved in the second direction together with the movable arms 108 by the repulsion force according to the projection material injection pressure when spraying the projection material, thereby setting the optimal spraying material to be relatively spaced apart from the inner surface of the pipe. Projection material injection can be performed with the distance adjusted to 100D (see (a) of FIG. 12). Accordingly, since the spraying distance of the projection material nozzles 110 on the inner surface of the pipe is automatically and uniformly varied according to the specifications of the pipe, etc., the surface treatment is uneven due to manual adjustment of the projection material spraying distance and the resulting deviation in the projection material spraying distance. Problems that arise can be prevented.

The elastic members 109 constitute a spray distance controller that moves the movable arms 108 respectively to adjust the distance of the projection nozzles 110 with respect to the inner surface of the pipe to the set optimal spray distance (100D). In this way, the spray distance controller including the elastic members 109 can implement the optimal spray distance (100D) in a non-contact manner.

Referring to FIG. 11, the shaft member 104 is composed of a hollow tube for transporting the projection material, and the projector A32 further includes a distribution block 115 and projection material transport lines 116. A distribution block 115 is provided at the tip of the shaft member 104. The distribution block 115 has a main flow path 113 connected to the hollow (inside formed along the length of the shaft member) of the shaft member 104, and branch flow paths 114 branched circumferentially from the main flow path 113. . The projection material transfer lines 116 connect the projection material nozzles 110 to the branch flow paths 114, respectively. According to this configuration, the projection material is supplied to the projection material nozzles 110 through the shaft member 104, the distribution block 115, and the projection material transport line 116 in order. The pressure delivery line of the projection material pressure delivery unit 330 is connected to the rear end of the shaft member 104 and supplies the projection material into the interior of the shaft member 104.

The projector A32 may further include a distribution guide 117 disposed between the main flow path 113 and the branch flow path 114. The distribution guide 117 can guide and evenly distribute the projection material transferred to the main flow path 113 through the hollow of the shaft member 104 to the branch flow paths 114. In order to distribute the projection material more uniformly, the distribution guide 117 may have guide surfaces 118 that are inclined from the center of the main flow path 113 to each of the branch flow paths 114. According to the guide surfaces 118, the projection material from the main flow path 113 can be naturally guided to each of the branch flow paths 114.

Reference numeral 119b in FIG. 10 provides a blocking wall at the rear of the rotary blasting head based on the traveling direction of the shot blasting device A30, thereby limiting the rear scattering of the projection material projected by the rotary blasting head and preventing the projection material from scattering backwards. It is a barrier that suppresses the backward diffusion of dust generated in large quantities during surface treatment. The barrier 119b is formed in a circular shape smaller than the pipe, the central portion is mounted on the center frame module 103, and an inclined opening at the lower part is provided to collect the projectiles that have fallen to the bottom of the pipe to the central area of the bottom of the pipe. is formed The blowing unit 119n can remove foreign substances such as dust by spraying gas toward the projectiles collected through the inclined opening. While the shot blasting device (A30) moves (advances) along the inside of the pipe and performs a surface treatment process on the inner surface of the pipe, the barrier (119b) moves in the same direction and blasts the projectiles that fell on the bottom of the pipe into the pipe. It can be collected in the central area of the floor, and the projection material recovery unit 350 can recover the projection materials collected by the guidance action of the inclined opening of the barrier 119b and the foreign matter removed by the blowing unit 119n.

(Coating device) FIG. 15 conceptually shows the overall configuration of the painting device A50.

Referring to FIG. 15, the painting device A50 may include a self-propelled car body (bogie, 510) configured to move along the pipe (inside) of the pipe. The car body 510 of the painting device A50 includes a plurality of car body frames connected to each other in series by a link mechanism, and the paint supply unit 530 and the painting head assembly 540 are attached to these car body frames in the painting device A50. ) can be mounted sequentially from the front based on the working direction. This loading order is an example and may vary depending on implementation conditions, etc. The paint supply unit 530 side is at the rear, and the painting head assembly 540 side is at the front, and the painting device A50 can perform a painting process while moving backward in the rehabilitation section 12.

The painting head assembly 540 may receive paint from the paint supply unit 530 and paint the inner surface of the tube to form a new coating film on the inner surface of the tube. The painting head assembly 540 may include painting heads 545 that spray paint onto the inner surface of the pipe while rotating about a forward-backward axis by a driving force from a motor or the like.

Although the present invention has been described above, the present invention is not limited to the disclosed embodiments and the accompanying drawings, and various modifications may be made by those skilled in the art without departing from the technical spirit of the present invention. Additionally, the technical ideas described in the embodiments of the present invention may be implemented independently or in combination of two or more.

10: Pipe 12: Rehabilitation section
A10: Paint film removal device A11: Car body of paint film removal device
A12: Rotating assembly A13: Cutter
A14: Elevating assembly A30: Shot blasting device
A31: Body of shot blasting device A32: Projector
A33: Projection material feeder A50: Painting device
100D: Optimum spraying distance 104: Axial member
105: axis drive unit 107: fixed arm
108: movable arm 109: elastic member
110: projection material nozzle 221: center axis
222: Rotating body 231: First arm
232: arm axis 233: second arm
234: cutter axis 235: rotary cutter
236: Actuator 237: Air vibrator
238: Pneumatic supply line 239: Air nozzle
310: Projection material supply tank 320: Projection material replenishment tank
325: Projection material supply line 330: Projection material pressure delivery unit
340: first suction module 345: second suction module

Claims (6)

a body that can move along the inside of the pipe; a rotating body provided on the vehicle body and rotated about a center axis in the front-back direction by a driving force; It is provided along the circumferential direction of the rotating body and includes a plurality of cutting machines for cutting the coating film to remove the coating film from the inner surface of the tube,
Each of the above cutting machines,
an inner first arm coupled to the rotating body; an outer second arm that is rotatably connected to the front end of the first arm about the arm axis in the front-back direction and is spaced apart from or approaches the inner surface of the tube depending on the direction of rotation; a rotary cutter provided at the tip of the second arm to be rotatable about the cutter axis in the front-back direction, and contacting the inner surface of the pipe when the second arm approaches the inner surface of the pipe; an actuator connected at both ends to the first arm and the second arm and bringing the rotary cutter into close contact with the inner surface of the pipe through an expansion/contraction operation; It includes a vibrator that applies vibration to the second arm to generate a fluctuation in the second arm in the rotation direction of the second arm,
The vibrator is an air vibrator driven by air pressure, the air vibrator is provided on the second arm, and an air nozzle that sprays air discharged from the air outlet toward the rotary cutter is connected to the air outlet of the air vibrator,
A coating film removal device for the rehabilitation of old pipes. delete In claim 1,
Characterized in that each of the cutting machines is connected to a cooling liquid supply line for supplying cooling liquid to the air nozzle and mixing it with the air sprayed by the air nozzle.
A coating film removal device for the rehabilitation of old pipes. Injecting a paint film removal device into the rehabilitation section of the pipe and removing the paint film from the inner surface of the pipe while moving the introduced paint film removal device along the inside of the pipe; Injecting a shot blasting device into the rehabilitation section and moving the inserted shot blasting device along the interior of the pipe while performing surface treatment on the inner surface of the pipe from which the paint film has been removed; Injecting a painting device into the rehabilitation section and painting the inner surface of the pipe on which the surface treatment was performed while moving the introduced painting device along the interior of the pipe,
The paint film removal device includes a plurality of cutting machines that cut the paint film to remove the paint film,
Each of the above cutting machines,
a rotary cutter that rotates around a center axis in the front-back direction, is in close contact with the inner surface of the pipe, and is capable of self-rotation around the cutter axis; Including a vibrator that applies vibration to the rotating cutter,
The vibrator is an air vibrator driven by air pressure, and an air nozzle that sprays air discharged from the air outlet toward the rotary cutter is connected to the air outlet of the air vibrator,
How to revitalize old pipes. delete In claim 4,
The shot blasting device includes a fixed arm; a movable arm provided on the fixed arm to be movable in a first direction in which a tip portion is spaced apart from the inner surface of the pipe and in a second direction in which the tip portion is closer to the inner surface of the pipe; a projection material nozzle provided on the movable arm and spraying the projection material into the inner surface of the pipe along the second direction using pneumatic pressure; It includes a spray distance controller that moves the movable arm to adjust the distance of the projection nozzle to the inner surface of the pipe to a set optimal spray distance,
The spray distance adjuster includes an elastic member between the fixed arm and the movable arm that provides elastic force to the movable arm in the second direction, and the elastic member is configured to generate an elastic force generated when the projection material is sprayed by the projection material nozzle. Having elasticity to allow movement of the movable arm in the first direction according to the repulsion force to adjust the distance of the projection nozzle with respect to the inner surface of the pipe to the optimal injection distance,
How to revitalize old pipes.

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